html, body {
  margin: 0;
  padding: 0;
}
canvas {
  display: block;
}

/*html, 
body {
    margin: 0;
    padding: 0;
    height: 100vh; 
    overflow: hidden; 
    position: relative; 
}
    
canvas {
    display: block; 
    max-width: 100%; 
    max-height: 100vh; 
    width: auto; 
    height: auto; 
    object-fit: cover; 
    position: absolute; 
    top: 50%; 
    left: 50%; 
    transform: translate(-50%, -50%); 
}*/